The Obvious But Easily Overlooked

This is something you really do not want see (Photo A). On the MZ the battery positive feec should be green and red not brown as it is here. It looks like someone has tried to get the bike going at some point and forgot which terminal was which. On a dynamo equipped machine such as this bike it's not good news but the situation is probably salvageable. If this was a machine fitted with any kind of alternator the damage could be serious and extreme. At the very minimum the machine's electrical control systems will be damaged and quite possibly some of the wiring as well. If you're really unlucky on a machine fitted with electronic ignition you may scramble this as well. Always make sure you know what the wiring colours are for the battery; if in doubt mark the frame or battery carrier so you can't get it wrong.


Before you start ripp ng looms apart, taking components off to test or substitute, stop and make copious notes (Picture B). A set of digital photos can be very useful as a later reference.

Once the loom is spread out across the workbench it's too late to wonder where that strange brown and yellow wire you didn't spot before goes to. Many t kes will have been repaired or modified

0 er the years and there's a fair chance

1 \\ whoever did the job will not have .! 3d the correct colour-codec wire.

I tunning repairs that actually work en vi jtorcycle electrics nave a nasty habit ( being left alone; it's highly likely that i '¡at an emergency repair may have been ■ It in place permanently. Never blindly low the wiring diagram in an ermarket manual; they have a habit being inaccurate and/or generic to a ier range of machines. Make sure the colour codes are correct and follow through some of the circuits to make sure your map is correct. Even factory manuals can sometimes get it wrong so check and check again.

This is actually all frighteningly logical but if all else fails RTFM (read the flaming manual); it may have a few errors but at least it will identify the key components and point you in the right direction. Finally, when it comes to mapping the electrics, if the wiring appears to be non-standard in any area but the b ke was running OK don't dismiss what's in front of your eyes. It's like that for g reason so figure out why.

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